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0688-SOM-00001, Rev: 02 © Tritech International Ltd.
C.2. DelGrosso Equation
Source: NPL Technical Guides – Speed of Sound in Sea-water
Validity: T = 0 to 30oC, S = 30 to 40ppt, P = 0 to 1000 kg/cm2 (Wong and Zhu, 1995)
C.3. Wood Equation
Source: The Hydrographic Society Special Publication No. 34
Validity: Unknown.
C.4. Mackenzie Equation
Source: NPL Technical Guides – Speed of Sound in Sea-water
Validity: T = 2 to 30oC, S = 25 to 40psu, D = 0 to 8000 meters (K.V. Mackenzie, 1981)
C
000
+ ΔC
T
+ ΔC
S
+ ΔC
P
+ ΔC
STP
C
TP
TP + C
T3P
T
3
P + C
TP2
TP
2
+ C
T2P2
T
2
P
2
+ C
TP3
TP
3
+
C
ST
ST + C
ST2
ST
2
+ C
STP
STP + C
S2TP
S
2
TP + C
S2P2
S
2
P
2
T = temperature in degrees Celsius
S = salinity in Practical Salinity Units
P = pressure in kg/cm
2
(where 100 kPa = 1.019716 kg/cm
2
)
C
000
+ ΔC
T
+ ΔC
S
+ ΔC
P
+ ΔC
STP
C
TP
TP + C
T3P
T
3
P + C
TP2
TP
2
+ C
T2P2
T
2
P
2
+ C
TP3
TP
3
+
C
ST
ST + C
ST2
ST
2
+ C
STP
STP + C
S2TP
S
2
TP + C
S2P2
S
2
P
2
T = temperature in degrees Celsius
S = salinity in Practical Salinity Units
P = pressure in kg/cm
2
(where 100 kPa = 1.019716 kg/cm
2
)